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| Strain | Number of ORFs missing (of the 4290 in MG1655) | Amount of unique DNA (relative to MG1655)a |
|---|---|---|
| W3110 | 82 | 65 kb |
| ECOR 21 | 318 | 77 kb |
| ECOR 37 | 392 | 1183 kb |
| ECOR 40 | 324 | 925 kb |
aCalculated from amounts of missing DNA as determined by filter hybridizations and total chromosome lengths.
